研究表明，洪旱灾害受灾面积的时序分布具有分形特征。
The time serials was discussed and the fractal dimension was computed.
最后依据干旱指数建立了干旱受灾面积和成灾面积评估模式，以及干旱经济损失评估模式。
Finally, assessment the model of area covered by drought, the area affected by drought and the economic losses of agriculture by drought is established according the drought index.
问题的关键在于即使是从近距离的上空也难以知道这次灾难的受灾面积，何况是几千英里之外，难度就更大了。
The point is that it is hard to get a sense of this disaster's scale, even from up close but all the more so from thousands of miles away.
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